Help polymers

Help I get the first example with hcl but not the h2s one… how do I do this 😭
I don’t get why it’s s2- and not just a because the 2 is on the outside of brackets

Not my exam board but I'll give it a go - so for H2S it seems that one H2S molecule protonates two MEA molecules - the remaining S2- ion forms ionic bonds with two protonated MEA molecules (each with a charge of 1+), hence forming a neutrally changed molecule (ie a salt). Sort of similar to Mg(OH)2, the 2 outside the brackets symbolises two hydroxide or MEA molecules.

Hope this helped!

Help I get the first example with hcl but not the h2s one… how do I do this 😭
I don’t get why it’s s2- and not just a because the 2 is on the outside of brackets

What’s ur exam board is it ocr a? I’m doing ocr a